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Fair Value (Tables)
6 Months Ended
Jun. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Financial Assets and Liabilities, Measured at Fair Value Recurring Basis [Table Text Block]
The following table presents a summary of fair value measurements by level and carrying values for items measured at fair value on a recurring basis in the Condensed Consolidated Balance Sheets:
(in millions)Quoted Prices
in Active
Markets
(Level 1)
Other
Observable
Inputs
(Level 2)
Unobservable
Inputs
(Level 3)
Total
Fair and Carrying
Value
June 30, 2024
Cash and cash equivalents$26,070$216$$26,286
Debt securities - available-for-sale:
U.S. government and agency obligations4,5711724,743
State and municipal obligations6,9066,906
Corporate obligations2021,76819721,985
U.S. agency mortgage-backed securities8,4248,424
Non-U.S. agency mortgage-backed securities2,6762,676
Total debt securities - available-for-sale4,59139,94619744,734
Equity securities1,70116691,786
Assets under management 1,4141,8931073,414
Total assets at fair value$33,776$42,071$373$76,220
Percentage of total assets at fair value44 %55 %%100 %
December 31, 2023
Cash and cash equivalents$25,345$82$$25,427
Debt securities - available-for-sale:
U.S. government and agency obligations4,1672764,443
State and municipal obligations7,3537,353
Corporate obligations1521,80020222,017
U.S. agency mortgage-backed securities8,2968,296
Non-U.S. agency mortgage-backed securities2,7862,786
Total debt securities - available-for-sale4,18240,51120244,895
Equity securities2,46816692,553
Assets under management 1,5052,1401103,755
Total assets at fair value$33,500$42,749$381$76,630
Percentage of total assets at fair value44 %55 %%100 %
Fair Value Measurements, Nonrecurring [Table Text Block]
The following table presents a summary of fair value measurements by level and carrying values for certain financial instruments not measured at fair value on a recurring basis in the Condensed Consolidated Balance Sheets:
(in millions)Quoted Prices
in Active
Markets
(Level 1)
Other
Observable
Inputs
(Level 2)
Unobservable
Inputs
(Level 3)
Total
Fair
Value
Total Carrying Value
June 30, 2024
Debt securities - held-to-maturity$531 $27 $— $558 $565 
Long-term debt and other financing obligations$— $61,144 $— $61,144 $65,186 
December 31, 2023
Debt securities - held-to-maturity$524 $72 $— $596 $603 
Long-term debt and other financing obligations$— $59,851 $— $59,851 $61,449